... ,auto night IR grasp, 5 or 7inch LCD screen,video calling &conversation with indoor extentions, guard centers, and ... stations,gate moniteringhandsfree function 8cord ringer tone Surface mount; Video and two way intercomDoor lock controlWith hand-move alarm ... 234(V) ~ Wiring method:6core & AV input ~ Main Fuction: video calling & conversation, door gate monitoring, handsfree operation; ~ Systems matching ...